Toothed gearing.



F. HUMPHRIS.

TOOTHED GEARING.

APPLIUA'L'ION FILED SEPTA 21, 1911.

/f-J VEN TO E v @OEA/EVS' Patented Oct. 8, 1912;

2 SHEFTS-SHEFT 1 agi.,-

. minill! Mr/VESSEJ F. HUMPHRIS.

TOOTHED GEARING.

APPLIOATION FILED 8211121, 1911.

Patented 0G13. 8, 1912.

2 SHEETS-SHEET 2.

i MTIVESSJS' 4 'www UNITED STATES `PATENTv OFFICE.

FRANK HUMPHRIS, 0F BARTON PEVERIL, EASTLEIGH, ENGLAND.

'roornnn GEARING.

Specification of Letters Patent.

Application filed September 21,- 1911. Serial No. $50,502.

piolile which represents the operative sur-A face of the coacting element in the other member of the gearing.y

The invention relates more particularly togenerating apparatus for use in the produc tion of the operative surfaces of the helmetshaped teeth and correspondingly shaped recesses or holes constituting the generated elements in the well-known 'Humphris type of gearing, described and illustrated in United States Patent No. 859662 and United States pending application Serial'No. 467154.

The invention consists in the combination with means whereby the entire movement- (hereinafter called the generating movement) required to produce an effect equivalent to that of the proper relative motion" at the predetermined velocity-ratio between the respective members of the gearing, each regarded as a whole, is coinn'iunicated to the work alone, of means whereby further relativeinovement (hereinafter called the feed movement between the work and the cut-- ter, cach regarded as a whole, may beproduced in a direction corresponding to that lof tlie perpendicular to the common tangent to the pitclrlines of bot-h members of the gearing.

The invention is thus distinguished from generative apparatus for use in the production of the operative surfaces of motionlransinitting elements in gearing of other kinds than those referred to above, and

wherein a rotary cutter representing the operative surface of a mot-iontransmitting element in one member of the gearing is employed to generate the operative surface of the enacting element in the other member of the gearing; inasmuch as, although in some rfi it has been proposed to communicate miller in the work alone, or to the 'cutter alone, t-he entire movement required to produce an effect equivalent to that of the velocity-ratio between the respective inein-l Patentea oct. 8,1912.

. proper relative motion at the predetermined bers of the gearing, no provision has heretofore been made for producing further relative movement between the work and thel cutter in a direction correspondingto that of the perpendicular to the common tangent to the pitch-lines of both members fof the gearing.

In the case of gearing of the Humphris type, wherein the motion-transmitting elements are constituted by helmebshaped teeth and correspondingly shaped recesses o1 holes on the respective members, and more especially in cases where (as in the preferred form of said type of gearing) the maximum 'thickness of each tooth and the minimum thickness of the materialwhich separates two adjacent holes, measured on the pitchlines of the respective members of the gearing, is approximately 0.7 'and 0.3 of the pitch respectively, it is necessary to provide means for 'producing (as above set fortn) relative movement between the work and the cutter, each regarded as a whole, in a direction corresponding to that of the perpendicular to the common tangent to the pitclilines of both members of the gearing, for

reason that, owing to the excessive (althpugll varying) amount of strain, not directlybalanced, to which during the generating operation the cutter is subjected in div rections not coincident with its axis of rotation, it is found impracticable to produce on the work a complete surface presenting the p true generated conliguration unless the total depth of cut is performed inprogressive stages', the depth of mutual engagement between the work and the cutter Abeing gradually increased at successive traversing movements of the work and cutter relatively to one another, from a minimum to the maximum required. Generating apparatus constructed in accordance with the present invention further enables the necessary strengthof parts, length of bearings, and consequent stability to be obtained (particun larly in the case of the cutter-spindle) which are essential to the attainment of mechanically perfect results in the manufacture more especially of gearing of small dimensions.

Figure l is a. sectional side elevation, Fig. fixed gudgeon E) is also made detachable 2 a plan, and Fig.l 3 an elevation lookfrom the support H3 through the medium of ing from the cutter in a direction parallel to. which it is mounted on the fixed portion l? 5 the, axis thereof, showing a form of generatof the machine. The bracket J2 is further 5e ing' mechanism for use in the production ot adjustable on guides j provided ,en the fixed the pinion-member of internal spur-gearing. portion E of the machine in a direction par- Thendrawings show an example of mechan allel to the axis ama. of the cutter, for the nism lttor generating teeth or holes in the purpose of varying the distance between the pinionnember of internal spur gearing. axes l2-Z) and e-e 55 A is cutter, which rotates about' the ltwill be obvious that thearrangement -horizon'tal axis a-a, while B is a, blank and construction of the machine may be clamped on the lower end of a vertical considerably varied in detail within the spindle Cl which is'journa-led in a bearing scope of the claim provided the result aimed J1 provided in a bracket J2 which straddles at remains the same in each case, 6o

the blank B and is adjustably fixed to a Claim. carrier D, the latter being rotatable about In apparatus for producing the operative a vertical 'gudgeon E supported by some vSurface of a motion transmitting element in fixed-portion F ot the machine. one member of peg and h'ole internal spur Angular movementof the carrier D about gearing by the generative action of a rotary 65 the gudgeon E (to an extent 'equal to the cutter having an effective profile which repangular pitch of the teeth or holes to be resents the operative surface of the coactproduced in the blank) may be effected by ing element in the other member of the gear'- any convenient means, such for example as ing, the combination 'with means for coma' tangent screw K1 rotatable in fixed bearmunicating to the work alone, the entire 70 ings 7a2 and engaging a toothed quadrant K2 movement required to produce an effect attaohedto the carrier. During such anguequivalent to that of the proper relative lar movement of the carrier D, simultaneous motion with the predetermined velocity partial lrotation of the blank B at xthe proper ratio between the respective members of velocity-ratio vis produced by the engagethe gearing, each regarded as a. whole, of 'I5 ment, with a stationary segmental rack H, means for producing further movement of of a ring of teeth G fixed to andrconcen the cutter toward the work in a direction trically with the lower member c of a dicorrespondingl to that of the perpendicular viding-head C Whose upper member 01 is to the common tangent plane to the pitch fast on the spindle C1; the pitch-diameter surfaces of both. .men ers oi the gearing, S0

of. the ring of teeth G being equal to that the common axis of v netry and of rota# y of the blank B While the pitchradius of tion of the cutter be also perpendicular the rack H is equal to that of the internal to said common tan .lane when the prowheel whereof the cutter A represents one longation of said ce airis intersects the hole (or tooth);A axis of rotation ot .i substantially as. 85

To suit blanks of diiterent diameters, the set forth.

ring of teeth G is ina-de detachable from the il HUMHRIS. member c to which it i's fixed; while to vWitnesses: suit internal 'wheels of dierentdiameters, ARTHUR G. N n,

the stationary segmental rack H (which is ALBERT E. Brin a typical embodiment of the invention,

i it is hereby eertiiied that .Letters latent No. LOMLGS, granted tf1 1912, upon the appiirationol Frank Humphris, ot' Barton Peverii, England, for an improvement in Toothed Gearing always mounted concentrically with the En le was erroneously issued to the inventor, said Humphris, whereas said Letters Patent should have been issued The .Hitt/parts Engineering Syndicate Limited, of London., Eng/milk as by the records ot' assignments of this otlice; and in the heading of' the printed cation anerror appears requiring correction as follows; Strike out the line ci 'Appiication filed and insert the words and figures, Appl/cotton )tied Janet?, 19.70, Sei/vfat 567.58?. Divided and this applcrftz'onlf September 25.1, Serrat 1Y0. 659,502; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Otiice.

Signed and sealed this 11th day of February, A. D., 1913.

' c. o. BiLLinos,

Act/12g Uommiss-z'owev' of Paf/tents.I

ions ia Letters Patent tio. ifttlttli,

[SEAL] ,ilerrect Figure l is a. sectional side elevation, Fig. fixed gudgeon E) is also made detachable 2 a plan, and Fig.l 3 an elevation lookfrom the support H3 through the medium of ing from the cutter in a direction parallel to. which it is mounted on the fixed portion l? 5 the, axis thereof, showing a form of generatof the machine. The bracket J2 is further 5e ing' mechanism for use in the production ot adjustable on guides j provided ,en the fixed the pinion-member of internal spur-gearing. portion E of the machine in a direction par- Thendrawings show an example of mechan allel to the axis ama. of the cutter, for the nism lttor generating teeth or holes in the purpose of varying the distance between the pinionnember of internal spur gearing. axes l2-Z) and e-e 55 A is cutter, which rotates about' the ltwill be obvious that thearrangement -horizon'tal axis a-a, while B is a, blank and construction of the machine may be clamped on the lower end of a vertical considerably varied in detail within the spindle Cl which is'journa-led in a bearing scope of the claim provided the result aimed J1 provided in a bracket J2 which straddles at remains the same in each case, 6o

the blank B and is adjustably fixed to a Claim. carrier D, the latter being rotatable about In apparatus for producing the operative a vertical 'gudgeon E supported by some vSurface of a motion transmitting element in fixed-portion F ot the machine. one member of peg and h'ole internal spur Angular movementof the carrier D about gearing by the generative action of a rotary 65 the gudgeon E (to an extent 'equal to the cutter having an effective profile which repangular pitch of the teeth or holes to be resents the operative surface of the coactproduced in the blank) may be effected by ing element in the other member of the gear'- any convenient means, such for example as ing, the combination 'with means for coma' tangent screw K1 rotatable in fixed bearmunicating to the work alone, the entire 70 ings 7a2 and engaging a toothed quadrant K2 movement required to produce an effect attaohedto the carrier. During such anguequivalent to that of the proper relative lar movement of the carrier D, simultaneous motion with the predetermined velocity partial lrotation of the blank B at xthe proper ratio between the respective members of velocity-ratio vis produced by the engagethe gearing, each regarded as a. whole, of 'I5 ment, with a stationary segmental rack H, means for producing further movement of of a ring of teeth G fixed to andrconcen the cutter toward the work in a direction trically with the lower member c of a dicorrespondingl to that of the perpendicular viding-head C Whose upper member 01 is to the common tangent plane to the pitch fast on the spindle C1; the pitch-diameter surfaces of both. .men ers oi the gearing, S0

of. the ring of teeth G being equal to that the common axis of v netry and of rota# y of the blank B While the pitchradius of tion of the cutter be also perpendicular the rack H is equal to that of the internal to said common tan .lane when the prowheel whereof the cutter A represents one longation of said ce airis intersects the hole (or tooth);A axis of rotation ot .i substantially as. 85

To suit blanks of diiterent diameters, the set forth.

ring of teeth G is ina-de detachable from the il HUMHRIS. member c to which it i's fixed; while to vWitnesses: suit internal 'wheels of dierentdiameters, ARTHUR G. N n,

the stationary segmental rack H (which is ALBERT E. Brin a typical embodiment of the invention,

i it is hereby eertiiied that .Letters latent No. LOMLGS, granted tf1 1912, upon the appiirationol Frank Humphris, ot' Barton Peverii, England, for an improvement in Toothed Gearing always mounted concentrically with the En le was erroneously issued to the inventor, said Humphris, whereas said Letters Patent should have been issued The .Hitt/parts Engineering Syndicate Limited, of London., Eng/milk as by the records ot' assignments of this otlice; and in the heading of' the printed cation anerror appears requiring correction as follows; Strike out the line ci 'Appiication filed and insert the words and figures, Appl/cotton )tied Janet?, 19.70, Sei/vfat 567.58?. Divided and this applcrftz'onlf September 25.1, Serrat 1Y0. 659,502; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Otiice.

Signed and sealed this 11th day of February, A. D., 1913.

' c. o. BiLLinos,

Act/12g Uommiss-z'owev' of Paf/tents.I

ions ia Letters Patent tio. ifttlttli,

[SEAL] ,ilerrect 

